An introduction Microbiology : Chemical
Principles Complete 2026–2027 Exam
Preparation Guide: Updated Question Bank,
Explained Solutions, Concept Review &
Effective Study Strategies
Description
The Complete 2026–2027 Exam Preparation Guide is a
structured and reliable resource developed to support
students in achieving better academic outcomes through
focused practice, clear explanations, and organized
revision.
This guide is designed to bridge the gap between learning
concepts and applying them in exams. By combining a
wide range of practice questions with clearly explained
solutions, it helps students understand not only the correct
answers but also the methods required to solve similar
problems independently.
What is the smallest unit of matter? - ANSWER✅An atom
What do atoms combine to form? - ANSWER✅Molecules
,What is the science of the interaction between atoms and molecules called? -
ANSWER✅Chemistry
What are the charged particles that move around the nucleus of an atom? -
ANSWER✅Electrons
What is located at the center of an atom? - ANSWER✅The nucleus
What particles make up the nucleus of an atom? - ANSWER✅Protons and neutrons
What charge do protons carry? - ANSWER✅Positive charge (1+)
What charge do neutrons carry? - ANSWER✅No charge (neutral)
What is the net charge of an atom? - ANSWER✅Electrically neutral
How is the atomic number of an element defined? - ANSWER✅By the number of
protons in the nucleus
What is the approximate weight of protons and neutrons compared to electrons? -
ANSWER✅About 1840 times that of an electron
What distinguishes one chemical element from another? - ANSWER✅The number of
protons in their nuclei
What is the symbol for hydrogen? - ANSWER✅H
What is the symbol for sodium derived from? - ANSWER✅Its Latin name, natrium (Na)
How many naturally occurring elements are there? - ANSWER✅92
How many elements are commonly found in living things? - ANSWER✅About 26
What are isotopes? - ANSWER✅Atoms with different numbers of neutrons in their
nuclei
Do all isotopes of an element have the same number of protons? - ANSWER✅Yes
What are the atomic masses of the three isotopes of oxygen? - ANSWER✅16, 17, and
18
How are atomic numbers represented in chemical notation? - ANSWER✅As a
subscript to the left of the element's symbol
, How are atomic masses represented in chemical notation? - ANSWER✅As a
superscript above the atomic number
What are some applications of isotopes in biology? - ANSWER✅Biological research,
medical diagnosis, treatment of disorders, and sterilization
Hydrogen - ANSWER✅Element with symbol H, atomic number 1, and approximate
atomic mass of 1.
Carbon - ANSWER✅Element with symbol C, atomic number 6, and approximate
atomic mass of 12.
Nitrogen - ANSWER✅Element with symbol N, atomic number 7, and approximate
atomic mass of 14.
Oxygen - ANSWER✅Element with symbol O, atomic number 8, and approximate
atomic mass of 16.
Sodium - ANSWER✅Element with symbol Na, atomic number 11, and approximate
atomic mass of 23.
Magnesium - ANSWER✅Element with symbol Mg, atomic number 12, and
approximate atomic mass of 24.
Phosphorus - ANSWER✅Element with symbol P, atomic number 15, and approximate
atomic mass of 31.
Sulfur - ANSWER✅Element with symbol S, atomic number 16, and approximate
atomic mass of 32.
Chlorine - ANSWER✅Element with symbol Cl, atomic number 17, and approximate
atomic mass of 35.
Potassium - ANSWER✅Element with symbol K, atomic number 19, and approximate
atomic mass of 39.
Calcium - ANSWER✅Element with symbol Ca, atomic number 20, and approximate
atomic mass of 40.
Iron - ANSWER✅Element with symbol Fe, atomic number 26, and approximate atomic
mass of 56.
Iodine - ANSWER✅Element with symbol I, atomic number 53, and approximate atomic
mass of 127.
Principles Complete 2026–2027 Exam
Preparation Guide: Updated Question Bank,
Explained Solutions, Concept Review &
Effective Study Strategies
Description
The Complete 2026–2027 Exam Preparation Guide is a
structured and reliable resource developed to support
students in achieving better academic outcomes through
focused practice, clear explanations, and organized
revision.
This guide is designed to bridge the gap between learning
concepts and applying them in exams. By combining a
wide range of practice questions with clearly explained
solutions, it helps students understand not only the correct
answers but also the methods required to solve similar
problems independently.
What is the smallest unit of matter? - ANSWER✅An atom
What do atoms combine to form? - ANSWER✅Molecules
,What is the science of the interaction between atoms and molecules called? -
ANSWER✅Chemistry
What are the charged particles that move around the nucleus of an atom? -
ANSWER✅Electrons
What is located at the center of an atom? - ANSWER✅The nucleus
What particles make up the nucleus of an atom? - ANSWER✅Protons and neutrons
What charge do protons carry? - ANSWER✅Positive charge (1+)
What charge do neutrons carry? - ANSWER✅No charge (neutral)
What is the net charge of an atom? - ANSWER✅Electrically neutral
How is the atomic number of an element defined? - ANSWER✅By the number of
protons in the nucleus
What is the approximate weight of protons and neutrons compared to electrons? -
ANSWER✅About 1840 times that of an electron
What distinguishes one chemical element from another? - ANSWER✅The number of
protons in their nuclei
What is the symbol for hydrogen? - ANSWER✅H
What is the symbol for sodium derived from? - ANSWER✅Its Latin name, natrium (Na)
How many naturally occurring elements are there? - ANSWER✅92
How many elements are commonly found in living things? - ANSWER✅About 26
What are isotopes? - ANSWER✅Atoms with different numbers of neutrons in their
nuclei
Do all isotopes of an element have the same number of protons? - ANSWER✅Yes
What are the atomic masses of the three isotopes of oxygen? - ANSWER✅16, 17, and
18
How are atomic numbers represented in chemical notation? - ANSWER✅As a
subscript to the left of the element's symbol
, How are atomic masses represented in chemical notation? - ANSWER✅As a
superscript above the atomic number
What are some applications of isotopes in biology? - ANSWER✅Biological research,
medical diagnosis, treatment of disorders, and sterilization
Hydrogen - ANSWER✅Element with symbol H, atomic number 1, and approximate
atomic mass of 1.
Carbon - ANSWER✅Element with symbol C, atomic number 6, and approximate
atomic mass of 12.
Nitrogen - ANSWER✅Element with symbol N, atomic number 7, and approximate
atomic mass of 14.
Oxygen - ANSWER✅Element with symbol O, atomic number 8, and approximate
atomic mass of 16.
Sodium - ANSWER✅Element with symbol Na, atomic number 11, and approximate
atomic mass of 23.
Magnesium - ANSWER✅Element with symbol Mg, atomic number 12, and
approximate atomic mass of 24.
Phosphorus - ANSWER✅Element with symbol P, atomic number 15, and approximate
atomic mass of 31.
Sulfur - ANSWER✅Element with symbol S, atomic number 16, and approximate
atomic mass of 32.
Chlorine - ANSWER✅Element with symbol Cl, atomic number 17, and approximate
atomic mass of 35.
Potassium - ANSWER✅Element with symbol K, atomic number 19, and approximate
atomic mass of 39.
Calcium - ANSWER✅Element with symbol Ca, atomic number 20, and approximate
atomic mass of 40.
Iron - ANSWER✅Element with symbol Fe, atomic number 26, and approximate atomic
mass of 56.
Iodine - ANSWER✅Element with symbol I, atomic number 53, and approximate atomic
mass of 127.
